Pick any clamp for 4.00, take 'em all for 15.00.
The black Redline fits newer frames, its a larger hole. The PMC is for old school mini frames and has a bolt broken off in it. The rest are for normal 1" posts, theres a Redline, a Suntour Copy, one that looks like a GT and an unknown black one. Some may not have bolts. Call dibs on which one you want, paypal addy is: firstname.lastname@example.org